Channel state information reference signal resource pairs

ABSTRACT

Apparatuses, methods, and systems are disclosed for channel state information reference signal resource pairs. One method ( 600 ) includes transmitting ( 602 ) information indicating: at least one pair of channel state information reference signal resources; wherein the information comprises one or more identifiers, and each identifier of the one or more identifiers corresponding to the at least one pair of channel state information reference signal resources.

FIELD

The subject matter disclosed herein relates generally to wirelesscommunications and more particularly relates to channel stateinformation reference signal resource pairs.

BACKGROUND

The following abbreviations are herewith defined, at least some of whichare referred to within the following description: Third GenerationPartnership Project (“3GPP”), 5G QoS Indicator (“5QI”), Acknowledge Mode(“AM”), Aperiodic (“AP”), Backhaul (“BH”), Broadcast Multicast (“BM”),Buffer Occupancy (“BO”), Base Station (“BS”), Buffer Status Report(“BSR”), Bandwidth (“BW”), Bandwidth Part (“BWP”), Carrier Aggregation(“CA”), Component Carrier (“CC”), Code Division Multiplexing (“CDM”),Control Element (“CE”), Coordinated Multipoint (“CoMP”), Categories ofRequirements (“CoR”), Control Resource Set (“CORESET”), Cyclic Prefix(“CP”), Cyclic Prefix OFDM (“CP-OFDM”), CSI-RS Resource Indicator(“CRI”), Cell RNTI (“C-RNTI”), Channel State Information (“CSI”), CSI IM(“CSI-IM”), CSI RS (“CSI-RS”), Channel Quality Indicator (“CQI”),Central Unit (“CU”), Codeword (“CW”), Downlink Assignment Index (“DAI”),Downlink Control Information (“DCI”), Downlink (“DL”), Discrete FourierTransform Spread OFDM (“DFT-s-OFDM”), Demodulation Reference Signal(“DMRS” or “DM-RS”), Data Radio Bearer (“DRB”), Dedicated Short-RangeCommunications (“DSRC”), Distributed Unit (“DU”), Enhanced MobileBroadband (“eMBB”), Evolved Node B (“eNB”), Enhanced SubscriberIdentification Module (“eSIM”), Enhanced (“E”), Frequency DivisionDuplex (“FDD”), Frequency Division Multiple Access (“FDMA”), FrequencyRange (“FR”), 450 MHz - 6000 MHz (“FR1”), 24250 MHz - 52600 MHz (“FR2”),Hybrid Automatic Repeat Request (“HARQ”), High-Definition MultimediaInterface (“HDMI”), Integrated Access Backhaul (“IAB”), Identity orIdentifier or Identification (“ID”), Information Element (“IE”),Interference Measurement (“IM”), International Mobile SubscriberIdentity (“IMSI”), Internet-of-Things (“IoT”), Internet Protocol (“IP”),Joint Transmission (“JT”), Level 1 (“L1”), L1 RSRP (“L1-RSRP”), L1 SINR(“L1-SINR”), Logical Channel (“LCH”), Logical Channel Group (“LCG”),Logical Channel ID (“LCID”), Logical Channel Prioritization (“LCP”),Layer Indicator (“LI”), Long Term Evolution (“LTE”), Levels ofAutomation (“LoA”), Medium Access Control (“MAC”), Modulation CodingScheme (“MCS”), Multi DCI (“M-DCI”), Master Information Block (“MIB”),Multiple Input Multiple Output (“MIMO”), Mobile-Termination (“MT”),Machine Type Communication (“MTC”), Multi PDSCH (“Multi-PDSCH”), MultiTRP (“M-TRP”), Multi-User (“MU”), Multi-User MIMO (“MU-MIMO”), MinimumMean Square Error (“MMSE”), Negative-Acknowledgment (“NACK”) or (“NAK”),Next Generation (“NG”), Next Generation Node B (“gNB”), New Radio(“NR”), Non-Zero Power (“NZP”), NZP CSI-RS (“NZP-CSI-RS”), OrthogonalFrequency Division Multiplexing (“OFDM”), Peak-to-Average Power Ratio(“PAPR”), Physical Broadcast Channel (“PBCH”), Physical Downlink ControlChannel (“PDCCH”), Physical Downlink Shared Channel (“PDSCH”), PDSCHConfiguration (“PDSCH-Config”), Policy Control Function (“PCF”), PacketData Convergence Protocol (“PDCP”), Packet Data Network (“PDN”),Protocol Data Unit (“PDU”), Public Land Mobile Network (“PLMN”),Precoding Matrix Indicator (“PMI”), ProSe Per Packet Priority (“PPPP”),ProSe Per Packet Reliability (“PPPR”), Physical Resource Block (“PRB”),Packet Switched (“PS”), Physical Sidelink Control Channel (“PSCCH”),Physical Sidelink Shared Channel (“PSSCH”), Phase Tracking RS (“PTRS” or“PT-RS”), Physical Uplink Control Channel (“PUCCH”), Physical UplinkShared Channel (“PUSCH”), Quasi Co-Located (“QCL”), Quality of Service(“QoS”), Random Access Channel (“RACH”), Radio Access Network (“RAN”),Radio Access Technology (“RAT”), Resource Element (“RE”), RadioFrequency (“RF”), Rank Indicator (“RI”), Radio Link Control (“RLC”),Radio Link Failure (“RLF”), Radio Network Temporary Identifier (“RNTI”),Resource Pool (“RP”), Radio Resource Control (“RRC”), Remote Radio Head(“RRH”), Reference Signal (“RS”), Reference Signal Received Power(“RSRP”), Reference Signal Received Quality (“RSRQ”), Receive (“RX”),Single Carrier Frequency Domain Spread Spectrum (“SC-FDSS”), SecondaryCell (“SCell”), Sub Carrier Spacing (“SCS”), Single DCI (“S-DCI”),Spatial Division Multiplexing (“SDM”), Service Data Unit (“SDU”), SingleFrequency Network (“SFN”), Subscriber Identity Module (“SIM”),Signal-to-Interference Ratio (“SINR”), Sidelink (“SL”), Sequence Number(“SN”), Semi Persistent (“SP”), Scheduling Request (“SR”), SRS ResourceIndicator (“SRI”), Sounding Reference Signal (“SRS”), SynchronizationSignal (“SS”), SS/PBCH Block (“SSB”), Transport Block (“TB”),Transmission Configuration Indication (“TCI”), Time Division Duplex(“TDD”), Temporary Mobile Subscriber Identity (“TMSI”), TransmittedPrecoding Matrix Indicator (“TPMI”), Transmission Reception Point(“TRP”), Technical Standard (“TS”), Transmit (“TX”), UserEntity/Equipment (Mobile Terminal) (“UE”), Universal Integrated CircuitCard (“UICC”), Uplink (“UL”), Unacknowledged Mode (“UM”), UniversalMobile Telecommunications System (“UMTS”), LTE Radio Interface (“Uuinterface”), User Plane (“UP”), Universal Subscriber Identity Module(“USIM”), Universal Terrestrial Radio Access Network (“UTRAN”), Vehicleto Everything (“V2X”), Voice Over IP (“VoIP”), Visited Public LandMobile Network (“VPLMN”), Vehicle RNTI (“V-RNTI”), WorldwideInteroperability for Microwave Access (“WiMAX”), Zero Forcing (“ZF”),Zero Power (“ZP”), and ZP CSI-RS (“ZP-CSI-RS”). As used herein,“HARQ-ACK” may represent collectively the Positive Acknowledge (“ACK”)and the Negative Acknowledge (“NAK”). ACK means that a TB is correctlyreceived while NAK means a TB is erroneously received.

In certain wireless communications networks, UEs may travel at highspeeds.

BRIEF SUMMARY

Methods for channel state information reference signal resource pairsare disclosed. Apparatuses and systems also perform the functions of themethods. In one embodiment, the method includes transmitting informationindicating: at least one pair of channel state information referencesignal resources; wherein the information comprises one or moreidentifiers, and each identifier of the one or more identifierscorresponding to the at least one pair of channel state informationreference signal resources.

An apparatus for channel state information reference signal resourcepairs, in one embodiment, includes a transmitter that transmitsinformation indicating: at least one pair of channel state informationreference signal resources; wherein the information comprises one ormore identifiers, and each identifier of the one or more identifierscorresponding to the at least one pair of channel state informationreference signal resources.

A method for channel state information reference signal resource pairsincludes receiving information indicating: at least one pair of channelstate information reference signal resources; wherein the informationcomprises one or more identifiers, and each identifier of the one ormore identifiers corresponding to the at least one pair of channel stateinformation reference signal resources.

An apparatus for channel state information reference signal resourcepairs, in one embodiment, includes a receiver that receives informationindicating: at least one pair of channel state information referencesignal resources; wherein the information comprises one or moreidentifiers, and each identifier of the one or more identifierscorresponding to the at least one pair of channel state informationreference signal resources.

BRIEF DESCRIPTION OF THE DRAWINGS

A more particular description of the embodiments briefly described abovewill be rendered by reference to specific embodiments that areillustrated in the appended drawings. Understanding that these drawingsdepict only some embodiments and are not therefore to be considered tobe limiting of scope, the embodiments will be described and explainedwith additional specificity and detail through the use of theaccompanying drawings, in which:

FIG. 1 is a schematic block diagram illustrating one embodiment of awireless communication system for channel state information referencesignal resource pairs;

FIG. 2 is a schematic block diagram illustrating one embodiment of anapparatus that may be used for channel state information referencesignal resource pairs;

FIG. 3 is a schematic block diagram illustrating one embodiment of anapparatus that may be used for channel state information referencesignal resource pairs;

FIG. 4 is a schematic block diagram illustrating one embodiment of asystem including communications with a UE traveling at high speeds;

FIG. 5 is a schematic block diagram illustrating another embodiment of asystem including communications with a UE traveling at high speeds;

FIG. 6 is a schematic flow chart diagram illustrating one embodiment ofa method for channel state information reference signal resource pairs;

FIG. 7 is a schematic flow chart diagram illustrating another embodimentof a method for channel state information reference signal resourcepairs;

FIG. 8 is a schematic flow chart diagram illustrating a furtherembodiment of a method for channel state information reference signalresource pairs; and

FIG. 9 is a schematic flow chart diagram illustrating yet anotherembodiment of a method for channel state information reference signalresource pairs.

DETAILED DESCRIPTION

As will be appreciated by one skilled in the art, aspects of theembodiments may be embodied as a system, apparatus, method, or programproduct. Accordingly, embodiments may take the form of an entirelyhardware embodiment, an entirely software embodiment (includingfirmware, resident software, micro-code, etc.) or an embodimentcombining software and hardware aspects that may all generally bereferred to herein as a “circuit,” “module” or “system.” Furthermore,embodiments may take the form of a program product embodied in one ormore computer readable storage devices storing machine readable code,computer readable code, and/or program code, referred hereafter as code.The storage devices may be tangible, non-transitory, and/ornon-transmission. The storage devices may not embody signals. In acertain embodiment, the storage devices only employ signals foraccessing code.

Certain of the functional units described in this specification may belabeled as modules, in order to more particularly emphasize theirimplementation independence. For example, a module may be implemented asa hardware circuit comprising custom very-large-scale integration(“VLSI”) circuits or gate arrays, off-the-shelf semiconductors such aslogic chips, transistors, or other discrete components. A module mayalso be implemented in programmable hardware devices such as fieldprogrammable gate arrays, programmable array logic, programmable logicdevices or the like.

Modules may also be implemented in code and/or software for execution byvarious types of processors. An identified module of code may, forinstance, include one or more physical or logical blocks of executablecode which may, for instance, be organized as an object, procedure, orfunction. Nevertheless, the executables of an identified module need notbe physically located together, but may include disparate instructionsstored in different locations which, when joined logically together,include the module and achieve the stated purpose for the module.

Indeed, a module of code may be a single instruction, or manyinstructions, and may even be distributed over several different codesegments, among different programs, and across several memory devices.Similarly, operational data may be identified and illustrated hereinwithin modules, and may be embodied in any suitable form and organizedwithin any suitable type of data structure. The operational data may becollected as a single data set, or may be distributed over differentlocations including over different computer readable storage devices.Where a module or portions of a module are implemented in software, thesoftware portions are stored on one or more computer readable storagedevices.

Any combination of one or more computer readable medium may be utilized.The computer readable medium may be a computer readable storage medium.The computer readable storage medium may be a storage device storing thecode. The storage device may be, for example, but not limited to, anelectronic, magnetic, optical, electromagnetic, infrared, holographic,micromechanical, or semiconductor system, apparatus, or device, or anysuitable combination of the foregoing.

More specific examples (a non-exhaustive list) of the storage devicewould include the following: an electrical connection having one or morewires, a portable computer diskette, a hard disk, a random access memory(“RAM”), a read-only memory (“ROM”), an erasable programmable read-onlymemory (“EPROM” or Flash memory), a portable compact disc read-onlymemory (“CD-ROM”), an optical storage device, a magnetic storage device,or any suitable combination of the foregoing. In the context of thisdocument, a computer readable storage medium may be any tangible mediumthat can contain, or store a program for use by or in connection with aninstruction execution system, apparatus, or device.

Code for carrying out operations for embodiments may be any number oflines and may be written in any combination of one or more programminglanguages including an object oriented programming language such asPython, Ruby, Java, Smalltalk, C++, or the like, and conventionalprocedural programming languages, such as the “C” programming language,or the like, and/or machine languages such as assembly languages. Thecode may execute entirely on the user’s computer, partly on the user’scomputer, as a stand-alone software package, partly on the user’scomputer and partly on a remote computer or entirely on the remotecomputer or server. In the latter scenario, the remote computer may beconnected to the user’s computer through any type of network, includinga local area network (“LAN”) or a wide area network (“WAN”), or theconnection may be made to an external computer (for example, through theInternet using an Internet Service Provider).

Reference throughout this specification to “one embodiment,” “anembodiment,” or similar language means that a particular feature,structure, or characteristic described in connection with the embodimentis included in at least one embodiment. Thus, appearances of the phrases“in one embodiment,” “in an embodiment,” and similar language throughoutthis specification may, but do not necessarily, all refer to the sameembodiment, but mean “one or more but not all embodiments” unlessexpressly specified otherwise. The terms “including,” “comprising,”“having,” and variations thereof mean “including but not limited to,”unless expressly specified otherwise. An enumerated listing of itemsdoes not imply that any or all of the items are mutually exclusive,unless expressly specified otherwise. The terms “a,” “an,” and “the”also refer to “one or more” unless expressly specified otherwise.

Furthermore, the described features, structures, or characteristics ofthe embodiments may be combined in any suitable manner. In the followingdescription, numerous specific details are provided, such as examples ofprogramming, software modules, user selections, network transactions,database queries, database structures, hardware modules, hardwarecircuits, hardware chips, etc., to provide a thorough understanding ofembodiments. One skilled in the relevant art will recognize, however,that embodiments may be practiced without one or more of the specificdetails, or with other methods, components, materials, and so forth. Inother instances, well-known structures, materials, or operations are notshown or described in detail to avoid obscuring aspects of anembodiment.

Aspects of the embodiments are described below with reference toschematic flowchart diagrams and/or schematic block diagrams of methods,apparatuses, systems, and program products according to embodiments. Itwill be understood that each block of the schematic flowchart diagramsand/or schematic block diagrams, and combinations of blocks in theschematic flowchart diagrams and/or schematic block diagrams, can beimplemented by code. The code may be provided to a processor of ageneral purpose computer, special purpose computer, or otherprogrammable data processing apparatus to produce a machine, such thatthe instructions, which execute via the processor of the computer orother programmable data processing apparatus, create means forimplementing the functions/acts specified in the schematic flowchartdiagrams and/or schematic block diagrams block or blocks.

The code may also be stored in a storage device that can direct acomputer, other programmable data processing apparatus, or other devicesto function in a particular manner, such that the instructions stored inthe storage device produce an article of manufacture includinginstructions which implement the function/act specified in the schematicflowchart diagrams and/or schematic block diagrams block or blocks.

The code may also be loaded onto a computer, other programmable dataprocessing apparatus, or other devices to cause a series of operationalsteps to be performed on the computer, other programmable apparatus orother devices to produce a computer implemented process such that thecode which execute on the computer or other programmable apparatusprovide processes for implementing the functions/acts specified in theflowchart and/or block diagram block or blocks.

The schematic flowchart diagrams and/or schematic block diagrams in theFigures illustrate the architecture, functionality, and operation ofpossible implementations of apparatuses, systems, methods and programproducts according to various embodiments. In this regard, each block inthe schematic flowchart diagrams and/or schematic block diagrams mayrepresent a module, segment, or portion of code, which includes one ormore executable instructions of the code for implementing the specifiedlogical function(s).

It should also be noted that, in some alternative implementations, thefunctions noted in the block may occur out of the order noted in theFigures. For example, two blocks shown in succession may, in fact, beexecuted substantially concurrently, or the blocks may sometimes beexecuted in the reverse order, depending upon the functionalityinvolved. Other steps and methods may be conceived that are equivalentin function, logic, or effect to one or more blocks, or portionsthereof, of the illustrated Figures.

Although various arrow types and line types may be employed in theflowchart and/or block diagrams, they are understood not to limit thescope of the corresponding embodiments. Indeed, some arrows or otherconnectors may be used to indicate only the logical flow of the depictedembodiment. For instance, an arrow may indicate a waiting or monitoringperiod of unspecified duration between enumerated steps of the depictedembodiment. It will also be noted that each block of the block diagramsand/or flowchart diagrams, and combinations of blocks in the blockdiagrams and/or flowchart diagrams, can be implemented by specialpurpose hardware-based systems that perform the specified functions oracts, or combinations of special purpose hardware and code.

The description of elements in each figure may refer to elements ofproceeding figures. Like numbers refer to like elements in all figures,including alternate embodiments of like elements.

FIG. 1 depicts an embodiment of a wireless communication system 100 forchannel state information reference signal resource pairs. In oneembodiment, the wireless communication system 100 includes remote units102 and network units 104. Even though a specific number of remote units102 and network units 104 are depicted in FIG. 1 , one of skill in theart will recognize that any number of remote units 102 and network units104 may be included in the wireless communication system 100.

In one embodiment, the remote units 102 may include computing devices,such as desktop computers, laptop computers, personal digital assistants(“PDAs”), tablet computers, smart phones, smart televisions (e.g.,televisions connected to the Internet), set-top boxes, game consoles,security systems (including security cameras), vehicle on-boardcomputers, network devices (e.g., routers, switches, modems), IoTdevices, or the like. In some embodiments, the remote units 102 includewearable devices, such as smart watches, fitness bands, opticalhead-mounted displays, or the like. Moreover, the remote units 102 maybe referred to as subscriber units, mobiles, mobile stations, users,terminals, mobile terminals, fixed terminals, subscriber stations, UE,user terminals, a device, or by other terminology used in the art. Theremote units 102 may communicate directly with one or more of thenetwork units 104 via UL communication signals and/or the remote units102 may communicate directly with other remote units 102 via sidelinkcommunication.

The network units 104 may be distributed over a geographic region. Incertain embodiments, a network unit 104 may also be referred to as anaccess point, an access terminal, a base, a base station, a Node-B, aneNB, a gNB, a Home Node-B, a RAN, a relay node, a device, a networkdevice, an IAB node, a donor IAB node, or by any other terminology usedin the art. The network units 104 are generally part of a radio accessnetwork that includes one or more controllers communicably coupled toone or more corresponding network units 104. The radio access network isgenerally communicably coupled to one or more core networks, which maybe coupled to other networks, like the Internet and public switchedtelephone networks, among other networks. These and other elements ofradio access and core networks are not illustrated but are well knowngenerally by those having ordinary skill in the art.

In one implementation, the wireless communication system 100 iscompliant with the 5G or NG (Next Generation) standard of the 3GPPprotocol, wherein the network unit 104 transmits using NG RANtechnology. More generally, however, the wireless communication system100 may implement some other open or proprietary communication protocol,for example, WiMAX, among other protocols. The present disclosure is notintended to be limited to the implementation of any particular wirelesscommunication system architecture or protocol.

The network units 104 may serve a number of remote units 102 within aserving area, for example, a cell or a cell sector via a wirelesscommunication link. The network units 104 transmit DL communicationsignals to serve the remote units 102 in the time, frequency, and/orspatial domain.

In some embodiments, a network unit 104 may transmit informationindicating: at least one pair of channel state information referencesignal resources; wherein the information comprises one or moreidentifiers, and each identifier of the one or more identifierscorresponding to the at least one pair of channel state informationreference signal resources. Accordingly, a network unit 104 may be usedfor channel state information reference signal resource pairs.

In various embodiments, a remote unit 102 may receive informationindicating: at least one pair of channel state information referencesignal resources; wherein the information comprises one or moreidentifiers, and each identifier of the one or more identifierscorresponding to the at least one pair of channel state informationreference signal resources. Accordingly, a remote unit 102 may be usedfor channel state information reference signal resource pairs.

FIG. 2 depicts one embodiment of an apparatus 200 that may be used forchannel state information reference signal resource pairs. The apparatus200 includes one embodiment of the remote unit 102. Furthermore, theremote unit 102 may include a processor 202, a memory 204, an inputdevice 206, a display 208, a transmitter 210, and a receiver 212. Insome embodiments, the input device 206 and the display 208 are combinedinto a single device, such as a touchscreen. In certain embodiments, theremote unit 102 may not include any input device 206 and/or display 208.In various embodiments, the remote unit 102 may include one or more ofthe processor 202, the memory 204, the transmitter 210, and the receiver212, and may not include the input device 206 and/or the display 208.

The processor 202, in one embodiment, may include any known controllercapable of executing computer-readable instructions and/or capable ofperforming logical operations. For example, the processor 202 may be amicrocontroller, a microprocessor, a central processing unit (“CPU”), agraphics processing unit (“GPU”), an auxiliary processing unit, a fieldprogrammable gate array (“FPGA”), or similar programmable controller. Insome embodiments, the processor 202 executes instructions stored in thememory 204 to perform the methods and routines described herein. Theprocessor 202 is communicatively coupled to the memory 204, the inputdevice 206, the display 208, the transmitter 210, and the receiver 212.

The memory 204, in one embodiment, is a computer readable storagemedium. In some embodiments, the memory 204 includes volatile computerstorage media. For example, the memory 204 may include a RAM, includingdynamic RAM (“DRAM”), synchronous dynamic RAM (“SDRAM”), and/or staticRAM (“SRAM”). In some embodiments, the memory 204 includes non-volatilecomputer storage media. For example, the memory 204 may include a harddisk drive, a flash memory, or any other suitable non-volatile computerstorage device. In some embodiments, the memory 204 includes bothvolatile and non-volatile computer storage media. In some embodiments,the memory 204 also stores program code and related data, such as anoperating system or other controller algorithms operating on the remoteunit 102.

The input device 206, in one embodiment, may include any known computerinput device including a touch panel, a button, a keyboard, a stylus, amicrophone, or the like. In some embodiments, the input device 206 maybe integrated with the display 208, for example, as a touchscreen orsimilar touch-sensitive display. In some embodiments, the input device206 includes a touchscreen such that text may be input using a virtualkeyboard displayed on the touchscreen and/or by handwriting on thetouchscreen. In some embodiments, the input device 206 includes two ormore different devices, such as a keyboard and a touch panel.

The display 208, in one embodiment, may include any known electronicallycontrollable display or display device. The display 208 may be designedto output visual, audible, and/or haptic signals. In some embodiments,the display 208 includes an electronic display capable of outputtingvisual data to a user. For example, the display 208 may include, but isnot limited to, an LCD display, an LED display, an OLED display, aprojector, or similar display device capable of outputting images, text,or the like to a user. As another, non-limiting, example, the display208 may include a wearable display such as a smart watch, smart glasses,a heads-up display, or the like. Further, the display 208 may be acomponent of a smart phone, a personal digital assistant, a television,a table computer, a notebook (laptop) computer, a personal computer, avehicle dashboard, or the like.

In certain embodiments, the display 208 includes one or more speakersfor producing sound. For example, the display 208 may produce an audiblealert or notification (e.g., a beep or chime). In some embodiments, thedisplay 208 includes one or more haptic devices for producingvibrations, motion, or other haptic feedback. In some embodiments, allor portions of the display 208 may be integrated with the input device206. For example, the input device 206 and display 208 may form atouchscreen or similar touch-sensitive display. In other embodiments,the display 208 may be located near the input device 206.

In various embodiments, the receiver 212 may receive informationindicating: at least one pair of channel state information referencesignal resources; wherein the information comprises one or moreidentifiers, and each identifier of the one or more identifierscorresponding to the at least one pair of channel state informationreference signal resources. Although only one transmitter 210 and onereceiver 212 are illustrated, the remote unit 102 may have any suitablenumber of transmitters 210 and receivers 212. The transmitter 210 andthe receiver 212 may be any suitable type of transmitters and receivers.In one embodiment, the transmitter 210 and the receiver 212 may be partof a transceiver.

FIG. 3 depicts one embodiment of an apparatus 300 that may be used forchannel state information reference signal resource pairs. The apparatus300 includes one embodiment of the network unit 104. Furthermore, thenetwork unit 104 may include a processor 302, a memory 304, an inputdevice 306, a display 308, a transmitter 310, and a receiver 312. As maybe appreciated, the processor 302, the memory 304, the input device 306,the display 308, the transmitter 310, and the receiver 312 may besubstantially similar to the processor 202, the memory 204, the inputdevice 206, the display 208, the transmitter 210, and the receiver 212of the remote unit 102, respectively.

In some embodiments, the transmitter 310 may transmit informationindicating: at least one pair of channel state information referencesignal resources; wherein the information comprises one or moreidentifiers, and each identifier of the one or more identifierscorresponding to the at least one pair of channel state informationreference signal resources. Although only one transmitter 310 and onereceiver 312 are illustrated, the network unit 104 may have any suitablenumber of transmitters 310 and receivers 312. The transmitter 310 andthe receiver 312 may be any suitable type of transmitters and receivers.In one embodiment, the transmitter 310 and the receiver 312 may be partof a transceiver.

In certain embodiments, systems with high speed trains may have a singlefrequency network deployment.

FIG. 4 is a schematic block diagram illustrating one embodiment of asystem 400 including communications with a UE traveling at high speeds.The system 400 (e.g., a cell) includes a first RRH 402 (e.g., TRP) and asecond RRH 404 (e.g., TRP) that communicate with a UE 406. The first RRH402 and the second RRH 404 are deployed along a path (e.g., railwayline) on which the high speed vehicle 408 travels. In some embodiments,the first RRH 402 and the second RRH 404 share the same cell ID. Invarious embodiments, the first RRH 402 and the second RRH 404 areconnected to a gNB with an ideal backhaul and may jointly transmit DLdata to the UE 406 in PDSCH. Specifically, the first RRH 402 uses afirst communication channel 410 (e.g., one or more communicationchannels) and the second RRH 404 uses a second communication channel 412(e.g., one or more communication channels).

FIG. 5 is a schematic block diagram illustrating another embodiment of asystem 500 including communications with a UE traveling at high speeds.The system 500 (e.g., a cell) includes a first RRH 502 (e.g., TRP), asecond RRH 504 (e.g., TRP), a third RRH 506 (e.g., TRP), and a fourthRRH 508 (e.g., TRP) that communicate with a UE 510. The first RRH 502,the second RRH 504, the third RRH 506, and the fourth RRH 508 aredeployed along a path. The first RRH 502 uses a first communicationchannel 514 (e.g., one or more communication channels) to transmitCSI-RS (e.g., CSI-RS1) in a first CSI-RS resource, the second RRH 504uses a second communication channel 516 (e.g., one or more communicationchannels) to transmit CSI-RS (e.g., CSI-RS2) in a second CSI-RSresource, the third RRH 506 uses a third communication channel 518(e.g., one or more communication channels) to transmit CSI-RS (e.g.,CSI-RS3) in a third CSI-RS resource, and the fourth RRH 508 uses afourth communication channel 520 (e.g., one or more communicationchannels) to transmit CSI-RS (e.g., CSI-RS4) in a fourth CSI-RSresource. The different RRHs transmit different CSI-RS in differentCSI-RS resources. Different CSI-RS resources are configured fordifferent RRHs. By separating CSI-RS signals from different RRHs in atime domain and/or frequency domain, the UE 510 may distinguish betweendifferent DL signals from different RRHs.

In some embodiments, transmission of PDSCH may be done through pairs ofadjacent RRHs. For example, for an RRH pair including the first RRH 502and the second RRH 504, the first RRH 502 is configured to transmitCSI-RS in a first CSI-RS resource and the second RRH 504 is configuredto transmit CSI-RS in a second CSI-RS resource. PDSCH may be transmittedfrom two adjacent RRHs to the UE 510 using various transmissionsschemes, such as using a first transmission scheme (e.g., SFN from twoRRHs in all layers of data (e.g., transmission rank)) described inrelation to a first embodiment, and a second transmission scheme (e.g.,SDM transmissions from two RRHs) described in relation to a secondembodiment.

In the first embodiment, all layers in PDSCH are transmitted jointlyfrom both RRHs in a pair of RRHs. This may enable a strength of eachlayer to not vary significantly as the UE 510 moves from between the twoRRHs (e.g., moving from the first RRH 502 (back RRH) toward the secondRRH 504 (front RRH)). In the first embodiment, a DMRS of each layer isassociated with two CSI-RS resources for a QCL assumption (e.g., the twoCSI-RS resources are QCL). In certain configurations of the firstembodiment: 1) each PDSCH layer is transmitted by two RRHs (e.g., a pairof adjacent RRHs); 2) PDSCH is transmitted by the two RRHs sharing thesame DMRS ports (e.g., the same DMRS port number); 3) each DMRS port ofeach layer is associated with two CSI-RS resources (DMRS ports are inone or two CDM groups, depending on the number of DMRS ports); and/or 4)a TCI field in DCI format 1_1 indicates two TCI states, each of which isassociated with a CSI-RS resource as QCL type A or D (e.g., QCL type Amay correspond to {Doppler shift, Doppler spread, average delay, delayspread} - there may be a QCL correspondence between Doppler shift,Doppler spread, average delay, and delay spread, while QCL type D maycorrespond to {spatial RX parameter} - there may be a QCL correspondencefor the spatial RX parameter) and both TCI states are mapped to the sameset of DMRS ports.

In the second embodiment, each layer in PDSCH is transmitted from onlyone RRH. This may enable the UE 510 to separate a signal from differentRRHs with different Doppler shift in a spatial domain. In certainconfigurations of the second embodiment: 1) each PDSCH layer istransmitted by one of two adjacent RRHs, where all the layerstransmitted from an RRH (e.g., TRP) are in a same CDM group or groups;2) DMRS ports transmitted from an RRH are associated with one CSI-RSresource or two CSI-RS resources with different QCL type; and/or 3) aTCI field in DCI format 1_1 indicates two TCI states, each of which isassociated with a CSI-RS resource as QCL type A or D.

In various embodiments, the UE 510 is configured with multiple (e.g.,one or more) CSI report configurations. In such embodiments, each CSIreport configuration may have two CSI-RS resources (e.g., or pairs ofCSI-RS resources) for channel measurement transmitted from a pair ofadjacent RRHs. Based on these two CSI-RS resources for channelmeasurement, the UE 510 may compute CSI feedback as follows: {RI, PMI1,PMI2, CQI} for the first embodiment; or {RI1, RI2, PMI1, PMI2, CQI}, or{RI, PMI1, PMI2, CQI} for the second embodiment. RI1 and PMI1 are for afirst configured CSI-RS resource, and RI2 and PMI2 are for a secondconfigured CSI-RS resource. In some embodiments, PMI may only beconfigured as i1. If only one RI is included in the CSI feedback, itapplies to both CSI-RS resources (RI1=RI2=RI). RI1, RI2, PMI1, PMI2, andCQI are derived jointly from the two CSI-RS resources. If the total rankfrom two RRHs (RI_(total) = RI for the first embodiment, and RI_(total)= RI1+RI2 or 2^(∗)RI for the second embodiment) is larger than 4, twoCQIs (e.g., CQI1, CQI2) may be computed, one for each codeword. For thefirst embodiment and the second embodiment, if computing CSI feedback,the UE 510 may choose RI, PMI, and CQI to maximize a total PDSCHcapacity.

In such embodiments: A) one or more pairs of NZP CSI-RS resources may beconfigured in CSI-ReportConfig for channel measurement for which: {1) apair of NZP CSI-RS resources for channel measurement may be identifiedby a first CSI-RS resource ID if they are arranged as an ordered pair(CSI-RS 1, CSI-RS2), or may be identified by a separate index (an ID fora CSI-RS resource pair may be used in the place of CRI in CSI feedback);2) for a zero power CSI-IM resource configured for interferencemeasurement, it may follow a predetermined behavior; 3) if a resourcefor interference measurement based on NZP CSI-RS is configured and ifpairs of NZP CSI-RS are configured, the UE computes the CSI feedbackusing the pair of NZP CSI-RS for interference measurement correspondingto the pair of CSI-RS for channel measurement as interference (the UE510 may assume that a pair of NZP-CSI-RS resources for interferencemeasurement are QCLed with a pair of NZP-CSI-RS resources for channelmeasurement when computing CSI feedback); 4) for each measurement, anassociation between a resource setting for channel measurement and aresource setting for interference measurement (CSI-IM, NZP CSI-RS) mayfollow a predetermined behavior}; B) one or more pairs of CSI-RSresources for channel measurement and interference measurement may beintroduced in CSI-ResourceConfig; C) joint PMI1 & PMI2 may be computedbased on a pair of CSI-RS resources for channel measurement and/or apair of CSI-RS resources for interference measurement; and/or D) in CSIfeedback: {1) both PMI1 and PMI2 may be included in a CSI feedback inplace of PMI or i1 (e.g., i1 may refer to a subset of indicators from alarger set of indicators - a first index out of two indexes) (e.g.,cir-RI-i1-1 and cri-RI-i1-2 may be configured to be reported in oneCSI-ReportConfig); and/or 2) CQI reflects a channel quality if both PMI1and PMI2 are used (e.g., one or two CQIs may be included for one or twocodewords)}.

In some embodiments, if a gNB receives a CSI report from the UE 510, thegNB may schedule PDSCH transmission scheme according to the firstembodiment or the second embodiment based on CSI feedback.

FIG. 6 is a schematic flow chart diagram illustrating one embodiment ofa method 600 for channel state information reference signal resourcepairs. In some embodiments, the method 600 is performed by an apparatus,such as the network unit 104. In certain embodiments, the method 600 maybe performed by a processor executing program code, for example, amicrocontroller, a microprocessor, a CPU, a GPU, an auxiliary processingunit, a FPGA, or the like.

The method 600 may include transmitting 602 information indicating: atleast one pair of channel state information reference signal resources;wherein the information comprises one or more identifiers, and eachidentifier of the one or more identifiers corresponding to the at leastone pair of channel state information reference signal resources.

In certain embodiments, the information comprises a channel stateinformation resource configuration. In some embodiments, the informationcomprises a channel state information report configuration. In variousembodiments, the channel state information report configurationconfigures one or more pairs of channel state information referencesignal resources for channel measurement.

In one embodiment, the channel state information report configurationconfigures one or more pairs of non-zero power channel state informationreference signal resources for interference measurement, one or morechannel state information interference measurement resources forinterference measurement, or a combination thereof. In certainembodiments, the channel state information report configurationconfigures a report quantity field comprising one or two rankindicators, two precoder matrix indicators or two i1 indicators, and achannel quality indicator.

In various embodiments, the method 600 further comprises transmitting atransmission mode indicator that indicates a mode for transmittinginformation to a user equipment using a pair of transmission receptionpoints. In one embodiment, the method 600 further comprises receivingchannel state information feedback comprising a channel stateinformation reference signal resource indicator that indicates a pair ofchannel state information reference signal resources for channelmeasurement, wherein the channel state information feedback furthercomprises: one or two rank indicators; two precoder matrix indicators ortwo i1 indicators for the pair of channel state information referencesignal resources for channel measurement; and a channel qualityindicator for the pair of channel state information reference signalresources for channel measurement. In certain embodiments, the method600 further comprises scheduling a downlink transmission based on thechannel state information feedback.

FIG. 7 is a schematic flow chart diagram illustrating another embodimentof a method 700 for channel state information reference signal resourcepairs. In some embodiments, the method 700 is performed by an apparatus,such as the network unit 104. In certain embodiments, the method 700 maybe performed by a processor executing program code, for example, amicrocontroller, a microprocessor, a CPU, a GPU, an auxiliary processingunit, a FPGA, or the like.

The method 700 may include transmitting 702 information indicating: atleast one pair of channel state information reference signal resources;wherein the information comprises one or more identifiers, and eachidentifier of the one or more identifiers corresponding to the at leastone pair of channel state information reference signal resources. Themethod 700 also includes receiving 704 channel state informationfeedback comprising a channel state information reference signalresource indicator that indicates a pair of channel state informationreference signal resources for channel measurement, wherein the channelstate information feedback further comprises: one or two rankindicators; two precoder matrix indicators or two i1 indicators for thepair of channel state information reference signal resources for channelmeasurement; and a channel quality indicator for the pair of channelstate information reference signal resources for channel measurement.

In certain embodiments, the information comprises a channel stateinformation resource configuration. In some embodiments, the informationcomprises a channel state information report configuration. In variousembodiments, the channel state information report configurationconfigures one or more pairs of channel state information referencesignal resources for channel measurement.

In one embodiment, the channel state information report configurationconfigures one or more pairs of non-zero power channel state informationreference signal resources for interference measurement, one or morechannel state information interference measurement resources forinterference measurement, or a combination thereof. In certainembodiments, the channel state information report configurationconfigures a report quantity field comprising one or two rankindicators, two precoder matrix indicators or two i1 indicators, and achannel quality indicator.

In various embodiments, the method 700 further comprises transmitting atransmission mode indicator that indicates a mode for transmittinginformation to a user equipment using a pair of transmission receptionpoints. In certain embodiments, the method 700 further comprisesscheduling a downlink transmission based on the channel stateinformation feedback.

FIG. 8 is a schematic flow chart diagram illustrating a furtherembodiment of a method 800 for channel state information referencesignal resource pairs. In some embodiments, the method 800 is performedby an apparatus, such as the remote unit 102. In certain embodiments,the method 800 may be performed by a processor executing program code,for example, a microcontroller, a microprocessor, a CPU, a GPU, anauxiliary processing unit, a FPGA, or the like.

The method 800 may include receiving 802 information indicating: atleast one pair of channel state information reference signal resources;wherein the information comprises one or more identifiers, and eachidentifier of the one or more identifiers corresponding to the at leastone pair of channel state information reference signal resources.

In certain embodiments, the information comprises a channel stateinformation resource configuration. In some embodiments, the informationcomprises a channel state information report configuration. In variousembodiments, the channel state information report configurationconfigures one or more pairs of channel state information referencesignal resources for channel measurement.

In one embodiment, the channel state information report configurationconfigures one or more pairs of non-zero power channel state informationreference signal resources for interference measurement, one or morechannel state information interference measurement resources forinterference measurement, or a combination thereof. In certainembodiments, the channel state information report configurationconfigures a report quantity field comprising one or two rankindicators, two precoder matrix indicators or two i1 indicators, and achannel quality indicator.

In various embodiments, the method 800 further comprises receiving atransmission mode indicator that indicates a mode for transmittinginformation to a user equipment using a pair of transmissionconfiguration indication states. In one embodiment, the method 800further comprises transmitting channel state information feedbackcomprising a channel state information reference signal resourceindicator that indicates a pair of channel state information referencesignal resources for channel measurement, wherein the channel stateinformation feedback further comprises: one or two rank indicators; twoprecoder matrix indicators or two i1 indicators for the pair of channelstate information reference signal resources for channel measurement;and a channel quality indicator for the pair of channel stateinformation reference signal resources for channel measurement.

In certain embodiments, the one or two rank indicators, the two precodermatrix indicators or the two i1 indicators, and the channel qualityindicator are determined based on the pair of channel state informationreference signal resources for channel measurement, and a pair ofnon-zero power channel state information reference signal resources, achannel state information interference measurement resource, or acombination thereof. In some embodiments, the method 800 furthercomprises applying a quasi-co-location assumption of the pair of channelstate information reference signal resources for channel measurement toa pair of non-zero power channel state information reference signalresources for interference measurement.

In various embodiments, a channel state information reference signalresource identifier of the pair of channel state information referencesignal resources for channel measurement is used as the channel stateinformation reference signal resource indicator. In one embodiment, thechannel state information reference signal resource identifier occursonly once in the information.

FIG. 9 is a schematic flow chart diagram illustrating yet anotherembodiment of a method 900 for channel state information referencesignal resource pairs. In some embodiments, the method 900 is performedby an apparatus, such as the remote unit 102. In certain embodiments,the method 900 may be performed by a processor executing program code,for example, a microcontroller, a microprocessor, a CPU, a GPU, anauxiliary processing unit, a FPGA, or the like.

The method 900 may include receiving 902 information indicating: atleast one pair of channel state information reference signal resources;wherein the information comprises one or more identifiers, and eachidentifier of the one or more identifiers corresponding to the at leastone pair of channel state information reference signal resources. Incertain embodiments, the method 900 includes computing 904 channel stateinformation feedback based on the information. In one embodiment, themethod 900 further comprises transmitting 906 the channel stateinformation feedback comprising a channel state information referencesignal resource indicator that indicates a pair of channel stateinformation reference signal resources for channel measurement, whereinthe channel state information feedback further comprises: one or tworank indicators; two precoder matrix indicators or two i1 indicators forthe pair of channel state information reference signal resources forchannel measurement; and a channel quality indicator for the pair ofchannel state information reference signal resources for channelmeasurement.

In certain embodiments, the information comprises a channel stateinformation resource configuration. In some embodiments, the informationcomprises a channel state information report configuration. In variousembodiments, the channel state information report configurationconfigures one or more pairs of channel state information referencesignal resources for channel measurement.

In one embodiment, the channel state information report configurationconfigures one or more pairs of non-zero power channel state informationreference signal resources for interference measurement, one or morechannel state information interference measurement resources forinterference measurement, or a combination thereof. In certainembodiments, the channel state information report configurationconfigures a report quantity field comprising one or two rankindicators, two precoder matrix indicators or two i1 indicators, and achannel quality indicator.

In various embodiments, the method 900 further comprises receiving atransmission mode indicator that indicates a mode for transmittinginformation to a user equipment using a pair of transmissionconfiguration indication states.

In certain embodiments, the one or two rank indicators, the two precodermatrix indicators or the two i1 indicators, and the channel qualityindicator are determined based on the pair of channel state informationreference signal resources for channel measurement, and a pair ofnon-zero power channel state information reference signal resources, achannel state information interference measurement resource, or acombination thereof. In some embodiments, the method 800 furthercomprises applying a quasi-co-location assumption of the pair of channelstate information reference signal resources for channel measurement toa pair of non-zero power channel state information reference signalresources for interference measurement.

In various embodiments, a channel state information reference signalresource identifier of the pair of channel state information referencesignal resources for channel measurement is used as the channel stateinformation reference signal resource indicator. In one embodiment, thechannel state information reference signal resource identifier occursonly once in the information.

In one embodiment, a method comprises: transmitting informationindicating: at least one pair of channel state information referencesignal resources; wherein the information comprises one or moreidentifiers, and each identifier of the one or more identifierscorresponding to the at least one pair of channel state informationreference signal resources.

In certain embodiments, the information comprises a channel stateinformation resource configuration.

In some embodiments, the information comprises a channel stateinformation report configuration.

In various embodiments, the channel state information reportconfiguration configures one or more pairs of channel state informationreference signal resources for channel measurement.

In one embodiment, the channel state information report configurationconfigures one or more pairs of non-zero power channel state informationreference signal resources for interference measurement, one or morechannel state information interference measurement resources forinterference measurement, or a combination thereof.

In certain embodiments, the channel state information reportconfiguration configures a report quantity field comprising one or tworank indicators, two precoder matrix indicators or two i1 indicators,and a channel quality indicator.

In various embodiments, the method further comprises transmitting atransmission mode indicator that indicates a mode for transmittinginformation to a user equipment using a pair of transmission receptionpoints.

In one embodiment, the method further comprises receiving channel stateinformation feedback comprising a channel state information referencesignal resource indicator that indicates a pair of channel stateinformation reference signal resources for channel measurement, whereinthe channel state information feedback further comprises: one or tworank indicators; two precoder matrix indicators or two i1 indicators forthe pair of channel state information reference signal resources forchannel measurement; and a channel quality indicator for the pair ofchannel state information reference signal resources for channelmeasurement.

In certain embodiments, the method further comprises scheduling adownlink transmission based on the channel state information feedback.

In one embodiment, an apparatus comprises: a transmitter that transmitsinformation indicating: at least one pair of channel state informationreference signal resources; wherein the information comprises one ormore identifiers, and each identifier of the one or more identifierscorresponding to the at least one pair of channel state informationreference signal resources.

In certain embodiments, the information comprises a channel stateinformation resource configuration.

In some embodiments, the information comprises a channel stateinformation report configuration.

In various embodiments, the channel state information reportconfiguration configures one or more pairs of channel state informationreference signal resources for channel measurement.

In one embodiment, the channel state information report configurationconfigures one or more pairs of non-zero power channel state informationreference signal resources for interference measurement, one or morechannel state information interference measurement resources forinterference measurement, or a combination thereof.

In certain embodiments, the channel state information reportconfiguration configures a report quantity field comprising one or tworank indicators, two precoder matrix indicators or two i1 indicators,and a channel quality indicator.

In various embodiments, the transmitter transmits a transmission modeindicator that indicates a mode for transmitting information to a userequipment using a pair of transmission reception points.

In one embodiment, the apparatus further comprises a receiver thatreceives channel state information feedback comprising a channel stateinformation reference signal resource indicator that indicates a pair ofchannel state information reference signal resources for channelmeasurement, wherein the channel state information feedback furthercomprises: one or two rank indicators; two precoder matrix indicators ortwo i1 indicators for the pair of channel state information referencesignal resources for channel measurement; and a channel qualityindicator for the pair of channel state information reference signalresources for channel measurement.

In certain embodiments, the apparatus further comprises a processor thatschedules a downlink transmission based on the channel state informationfeedback.

In one embodiment, a method comprises: receiving information indicating:at least one pair of channel state information reference signalresources; wherein the information comprises one or more identifiers,and each identifier of the one or more identifiers corresponding to theat least one pair of channel state information reference signalresources.

In certain embodiments, the information comprises a channel stateinformation resource configuration.

In some embodiments, the information comprises a channel stateinformation report configuration.

In various embodiments, the channel state information reportconfiguration configures one or more pairs of channel state informationreference signal resources for channel measurement.

In one embodiment, the channel state information report configurationconfigures one or more pairs of non-zero power channel state informationreference signal resources for interference measurement, one or morechannel state information interference measurement resources forinterference measurement, or a combination thereof.

In certain embodiments, the channel state information reportconfiguration configures a report quantity field comprising one or tworank indicators, two precoder matrix indicators or two i1 indicators,and a channel quality indicator.

In various embodiments, the method further comprises receiving atransmission mode indicator that indicates a mode for transmittinginformation to a user equipment using a pair of transmissionconfiguration indication states.

In one embodiment, the method further comprises transmitting channelstate information feedback comprising a channel state informationreference signal resource indicator that indicates a pair of channelstate information reference signal resources for channel measurement,wherein the channel state information feedback further comprises: one ortwo rank indicators; two precoder matrix indicators or two i1 indicatorsfor the pair of channel state information reference signal resources forchannel measurement; and a channel quality indicator for the pair ofchannel state information reference signal resources for channelmeasurement.

In certain embodiments, the one or two rank indicators, the two precodermatrix indicators or the two i1 indicators, and the channel qualityindicator are determined based on the pair of channel state informationreference signal resources for channel measurement, and a pair ofnon-zero power channel state information reference signal resources, achannel state information interference measurement resource, or acombination thereof.

In some embodiments, the method further comprises applying aquasi-co-location assumption of the pair of channel state informationreference signal resources for channel measurement to a pair of non-zeropower channel state information reference signal resources forinterference measurement.

In various embodiments, a channel state information reference signalresource identifier of the pair of channel state information referencesignal resources for channel measurement is used as the channel stateinformation reference signal resource indicator.

In one embodiment, the channel state information reference signalresource identifier occurs only once in the information.

In one embodiment, an apparatus comprises: a receiver that receivesinformation indicating: at least one pair of channel state informationreference signal resources; wherein the information comprises one ormore identifiers, and each identifier of the one or more identifierscorresponding to the at least one pair of channel state informationreference signal resources.

In certain embodiments, the information comprises a channel stateinformation resource configuration.

In some embodiments, the information comprises a channel stateinformation report configuration.

In various embodiments, the channel state information reportconfiguration configures one or more pairs of channel state informationreference signal resources for channel measurement.

In one embodiment, the channel state information report configurationconfigures one or more pairs of non-zero power channel state informationreference signal resources for interference measurement, one or morechannel state information interference measurement resources forinterference measurement, or a combination thereof.

In certain embodiments, the channel state information reportconfiguration configures a report quantity field comprising one or tworank indicators, two precoder matrix indicators or two i1 indicators,and a channel quality indicator.

In various embodiments, the receiver receives a transmission modeindicator that indicates a mode for transmitting information to a userequipment using a pair of transmission configuration indication states.

In one embodiment, the apparatus further comprises a transmitter thattransmits channel state information feedback comprising a channel stateinformation reference signal resource indicator that indicates a pair ofchannel state information reference signal resources for channelmeasurement, wherein the channel state information feedback furthercomprises: one or two rank indicators; two precoder matrix indicators ortwo i1 indicators for the pair of channel state information referencesignal resources for channel measurement; and a channel qualityindicator for the pair of channel state information reference signalresources for channel measurement.

In certain embodiments, the one or two rank indicators, the two precodermatrix indicators or the two i1 indicators, and the channel qualityindicator are determined based on the pair of channel state informationreference signal resources for channel measurement, and a pair ofnon-zero power channel state information reference signal resources, achannel state information interference measurement resource, or acombination thereof.

In some embodiments, the apparatus further comprises a processor thatapplies a quasi-co-location assumption of the pair of channel stateinformation reference signal resources for channel measurement to a pairof non-zero power channel state information reference signal resourcesfor interference measurement.

In various embodiments, a channel state information reference signalresource identifier of the pair of channel state information referencesignal resources for channel measurement is used as the channel stateinformation reference signal resource indicator.

In one embodiment, the channel state information reference signalresource identifier occurs only once in the information.

Embodiments may be practiced in other specific forms. The describedembodiments are to be considered in all respects only as illustrativeand not restrictive. The scope of the invention is, therefore, indicatedby the appended claims rather than by the foregoing description. Allchanges which come within the meaning and range of equivalency of theclaims are to be embraced within their scope.

1. A method comprising: transmitting information indicating: at leastone pair of channel state information reference signal resources;wherein the information comprises one or more identifiers, and eachidentifier of the one or more identifiers corresponding to the at leastone pair of channel state information reference signal resources. 2.(canceled)
 3. (canceled)
 4. (canceled)
 5. (canceled)
 6. (canceled) 7.(canceled)
 8. (canceled)
 9. (canceled)
 10. An apparatus comprising: atransmitter that transmits information indicating: at least one pair ofchannel state information reference signal resources; wherein theinformation comprises one or more identifiers, and each identifier ofthe one or more identifiers corresponding to the at least one pair ofchannel state information reference signal resources.
 11. The apparatusof claim 10, wherein the information comprises a channel stateinformation resource configuration.
 12. The apparatus of claim 10,wherein the information comprises a channel state information reportconfiguration.
 13. The apparatus of claim 12, wherein the channel stateinformation report configuration configures one or more pairs of channelstate information reference signal resources for channel measurement.14. The apparatus of claim 13, wherein the channel state informationreport configuration configures one or more pairs of non-zero powerchannel state information reference signal resources for interferencemeasurement, one or more channel state information interferencemeasurement resources for interference measurement, or a combinationthereof.
 15. The apparatus of claim 13, wherein the channel stateinformation report configuration configures a report quantity fieldcomprising one or two rank indicators, two precoder matrix indicators ortwo i1 indicators, and a channel quality indicator.
 16. The apparatus ofclaim 13, wherein the transmitter transmits a transmission modeindicator that indicates a mode for transmitting information to a userequipment using a pair of transmission reception points.
 17. Theapparatus of claim 10, further comprising a receiver that receiveschannel state information feedback comprising a channel stateinformation reference signal resource indicator that indicates a pair ofchannel state information reference signal resources for channelmeasurement, wherein the channel state information feedback furthercomprises: one or two rank indicators; two precoder matrix indicators ortwo i1 indicators for the pair of channel state information referencesignal resources for channel measurement; and a channel qualityindicator for the pair of channel state information reference signalresources for channel measurement.
 18. The apparatus of claim 17,further comprising a processor that schedules a downlink transmissionbased on the channel state information feedback.
 19. (canceled) 20.(canceled)
 21. (canceled)
 22. (canceled)
 23. (canceled)
 24. (canceled)25. (canceled)
 26. (canceled)
 27. (canceled)
 28. (canceled) 29.(canceled)
 30. (canceled)
 31. An apparatus comprising: a receiver thatreceives information indicating: at least one pair of channel stateinformation reference signal resources; wherein the informationcomprises one or more identifiers, and each identifier of the one ormore identifiers corresponding to the at least one pair of channel stateinformation reference signal resources.
 32. (canceled)
 33. (canceled)34. The apparatus of claim 33, wherein the channel state informationreport configuration configures one or more pairs of channel stateinformation reference signal resources for channel measurement.
 35. Theapparatus of claim 34, wherein the channel state information reportconfiguration configures one or more pairs of non-zero power channelstate information reference signal resources for interferencemeasurement, one or more channel state information interferencemeasurement resources for interference measurement, or a combinationthereof.
 36. The apparatus of claim 34, wherein the channel stateinformation report configuration configures a report quantity fieldcomprising one or two rank indicators, two precoder matrix indicators ortwo i1 indicators, and a channel quality indicator.
 37. The apparatus ofclaim 34, wherein the receiver receives a transmission mode indicatorthat indicates a mode for transmitting information to a user equipmentusing a pair of transmission configuration indication states.
 38. Theapparatus of claim 31, further comprising a transmitter that transmitschannel state information feedback comprising a channel stateinformation reference signal resource indicator that indicates a pair ofchannel state information reference signal resources for channelmeasurement, wherein the channel state information feedback furthercomprises: one or two rank indicators; two precoder matrix indicators ortwo i1 indicators for the pair of channel state information referencesignal resources for channel measurement; and a channel qualityindicator for the pair of channel state information reference signalresources for channel measurement.
 39. The apparatus of claim 38,wherein the one or two rank indicators, the two precoder matrixindicators or the two i1 indicators, and the channel quality indicatorare determined based on the pair of channel state information referencesignal resources for channel measurement, and a pair of non-zero powerchannel state information reference signal resources, a channel stateinformation interference measurement resource, or a combination thereof.40. The apparatus of claim 38, further comprising a processor thatapplies a quasi-co-location assumption of the pair of channel stateinformation reference signal resources for channel measurement to a pairof non-zero power channel state information reference signal resourcesfor interference measurement.
 41. The apparatus of claim 38, wherein achannel state information reference signal resource identifier of thepair of channel state information reference signal resources for channelmeasurement is used as the channel state information reference signalresource indicator.
 42. The apparatus of claim 41, wherein the channelstate information reference signal resource identifier occurs only oncein the information.